Gear-cutter grinder.



H. nlIsLnil GEA'H CUTTER GR'INDER. "APPLICATION FILED JAN`61I9IL I V Y 1,249,631. Patented Dean, ma?.

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IH. R. ISLER.

GEAR CUTTER GHINDER. APPLlcAroN HLEUMN. 2e. |911.

Patented Dec. 11,1917.

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HERMAN R. ISLR, F NORWOOD, OHI, ASSIGNDR T0 THE OAKLEY MACHINE TOOL UQMPANY, 0F CINCINNATI, OHIO, .tit CLRPORATION Q1? 012110;

GEAR-CUTTER GRINDEH..

Specification of Letters Patent. Patented Dec, 11, 191 "L Application led January 26, 1917. Serial No. 1411,75?.

To all whom, t 'may concern Be it known that I, HERMAN ft. lsnnr., a citizen of the United States, and a resident of Norwood, in the county` of Hamilton and State of Ohio.. have invented certain new and useful Improvements in Gear-Cutter Grinders, of which the following ipsa full, clear, and exact description, reference heilig had to the accompanying drawings, form ing a part of this specification.

My invention relates to improvements in gear cutterwgrinders, and particularly to the provision of an attachment whereby gear cutters may be properly sharpened by successive operations of the grinding tool.

lt is essential, in order properly to sharpen the teeth of a gear cutter, that the cutting edges of the several teeth when sharpened, Shall be equidistant from the center and also that the faces of the teeth shall be in axial planes radially disposed. y

@ne object of my invention is to provide an attachment for a grinding machine of simple, inexpensiveand eflicient construction whereby the teeth of a gear cutter may be conveniently and expeditiously sharpened in the manner mentioned.` a

AAnother object ofmy invention is to provide a mechanism whereby the minute ad justments for the successive `operations of the grinding tool may be conveniently and rapidly performed.

Other objects of my invention will be apparent to those skilled in the art to which the sameappertains, from the followingdescription thereof, taken in connection with the accompanying drawings.

1n the drawings:

Figure 1 is a plan view of an attachment for grinding machines embodying my invention. i y j Fig; 2 is a side elevation of said attachment. j

lfig. 3 is a sectional view `of aportion of said invention.

The numeral 1 indicates the base of an attachment to be secured to the table lof a grinding machine. Guide lugs 2 arranged tofit into the nl'slot of said table, are secured to the bottom of said base as shown, and the attachment is secured against longitudinal movement in the slot by means of bolts in the slots 3 of the base in the ordinary manner. Mounted in the base 1 is a post a, the upper end of said post being ar ranged to receive a bushing 5 upon which the gear cutter to be sharpened is mounted, a collar (5 on the post being interposed between the bushing and the upper surfaceof the base. A standard 7 is provided on the base. The upper portion of said standard is provided with a threaded perforation for the attachment of an arm 8, the said arm j being provided with a slot 9 through which a holt 10 passes to secure the arm to 'the standard 7, the slot permitting longitudinal and rotary movements of the arm. The freeend of said arm has secured thereto, a rod 11, on the free endof which is a guide surfaceflQ disposed in a plane, axial and radial with :reference to the post d.

The base 1 is provided with an extension havinga boss 13, the upper surface of which is fiat. Perforations `14 are provided in said extension. A .slottedv pawl arm 15 is arranged to be secured by means of a bolt 16 passing through the slot thereof, and tln'ougheither of the perforations 1li, to the extension of the base. Pivotally mounted on one end of the pawl arm 15 is a head 18, one edge of the said head being rabbeted to engage the end of the pawl arm, toprovide flanges for such pivotal connection. The base of the rabbet in said head is so arranged, relatively to the end of the pawl arm, as to allow a limited movement about the pivotal mounting 17. A pawl 19 is adjustably mounted ina bore in said head. Arranged to bear against one end of the head 18 is a pin E20 slidablymounted in the pawl arm; a spring 21 compressed by a. screw 2Q bears against the pin 20 thrusting it outwardly against the head 18. An ad justing screw 23 in thehead 18 bears against the end of the pawl 19, and when screwed inwardly,"thrusts the said pawl forward for longitudinal adjustment. A screw Qt` in the head 19 secures the desired adjustment when obtained. A spacing collar 25 interposed between the pawl arm and the upper surface of the boss 13, provides play for the Vhead 18 in making necessary adjustments.

`In the use of my invention, the grinding `wheelisadjusted so that the cuttingplane thereof coincides with the guide surface 12 on the arm 8.l The cutter is also adjusted by placing one of its teeth against said surface. The point of the pawl 19 is then brought to bear against the base of such tootln In accomplishing this, large adjusta ments of Vthe ypaWl `are enacted by positioningtlieupaiyl armupon the boss 13, the perforations '1li theV slot the pa'uil permitting abroad range of adjustment of the pawl arm, the bolt beingsecurved in either of the perforations to increase or diminish the vdistance oi the arm from the gear cutter, and the slot in the pawl arm providing for longitudinaland pivotal adjustments of the arm relative to the base. Th 'finer' .adjustments erle effsstd'by means' of the adjusting screw 23, which operates the Paul '1.9, .Causing it, t0, occupi ,the .desired position, When :such adjustments have been effected, the arm 8 is rotated about the bolt l0y to the position partially shown by brolienlines in Fig. 2 Where is out of the Way. The face of the 'tooth isjthen ground in the .ordinary mannerv and the gear rotatedfon the post Atto bring theneXt tooth into grinding position, that is, Where the base of such tooth rests upon the point of the payvl 19, the pand springing outwardly ,o during such rotation against the pressure of y the spring'Ql and regaining `its' normal. po-

sition by reason Vof Vsuch spring when the tooth is in position.

The teeth of the gear cutter are thus ground in successi-on and the grinding-,of '30 each tooth isy necessarily in an axial plane radially disposed. vShould further cuts be necessary to complete the sharpening of the mehr the pawiie 'is Suitabiy adjusted by v. means of the adjusting screw 23 to provide or'small additional cuts of the cutter teeth. The adjustments voi the paWl by means of the. screw 23, as Willreadily be s een, may be enceedingly minute and accurate, and the .p'aiyl may thus be accurately set for the further grinding pf the teeth in axial'planes radially'disposed a's'abovfe set forth. .1f desited', the Screw 23 hiaybenrevded with a gale for determining 'the depth of Vsuccesl sive operations.

s ,Havihsihus'described .my invention, what I lillhs new and @Sirs/.t0 .Secure by Letters'jPfatent is: A v vdeyic'e of `the,character described, ,comprising ay base adapted to b'ecsecur'ed to farlrdnemadine ,100St Q11 Said bis@ ar'- a'nged t0 SUPPOPJ a cutter,- a Paw! arm ,adjustably @Haunted Q11 Said base, a head 'Pivp'tally' mounted 'on' said arr/n, al compression maribel* n'fposed'biw i011@ @nid Of Sad head and Said, PaWl farm, 211.191 ,aPlWl ald- :jlustibly mounted inthe other end oi''isaid ea i das@ ,of Aal@ character described, @message bassaapfd t0 be Secusfl t0 a grinding machine, a post on said base arranged to support-acutter, a member mounte'd'fon Said base whereby the grinding Wheel of said niachineinay be adjusted to a plane axial and radial with reference to said post, a pawl arm adjustably mounted on said base, a head pivotally mounted on said arm, a compression member interposedbctween one end of said'head and said pawl arm, and a paWl adjustably mountedin the other end of said head.. j 3. A device of the character described, ,comprising a lbase adapted to be secured to a grindingmachine', a 'post on said base a1'- ranged to support a cutter, a paivl arm adjustably mounted on said base, a pawl mounted in a bore on saidarm, and means bearing against the end of said pawl for adjusting said 'paWl longitudinally in said bore.

4t. A ldevice of the character described, comprising` a base adapted to be secured to a grinding machine, a post on said base arranged to support a cutter, a member mounted on said base whereby the grinding wheel of said machine may be adjusted to a plane axial and radial With reference to said post, a pawl arm adjustably mounted on said base, a pawl mounted in a bore on said arm, and means bearing against the end of said pawl for adjusting said pawl longitudinally in said bore.

5l dei/ice of the character described, comprising a base adapted to be secured to a grinding machine, a post on said base arranged to supporta cutter, a pawl arm ad'- justablyincunted on said base, a head pivotally mounted on .said arm,`a lcompression member interposed between one end of said head and said pawlarm, a pawl mounted in a bore in the'other end of said head, and means ,for adjusting said paWl longitudinally'in said borefv 6. device of the character described,

comprising base adapted to be secured to HERMAN n. isLEn. 'l

`"iniiiis'nf trliisfpatent :hay be lobtained for five cents each, by addressing" the "Commissioner of Patents, f f Washington, D. (2. l 

